Carbon Dioxide → N-[4-(2-Pyridyl)sulfonylphenyl]-3,3,3-trifluoro-2-hydroxy-2-trifluoromethyl-propanamide

Participants

Reaction Conditions

Reaction Steps

Tetrahydrofuran (5 ml, dry) was added to a mixture of 2,2-bis-trifluoromethyl-2-hydroxyacetic acid (0.98 g, 4.6 mmol) and 1,1'-carbonyldiimidazole (0.75 g, 4.6 mmol), while under a nitrogen atmosphere. There was an immediate evolution of carbon dioxide. The reaction was heated at 35° C. in an ultra-sound bath for 15 mins. The reaction was treated with a solution of 4-(2-pyridylsulfonyl)benzeneamine (1.08 g, 4.6 mmol) in dimethylformamide (11 ml, dry), heated at 46° C. for 18 hr, and then 60° C. for 24 hr. The incomplete reaction was treated with a solid mixture of 2,2-bis-trifluoromethyl-2-hydroxyacetic acid (0.22 g, 1.0 mmol) and 1,1'-carbonyldiimidazole (0.20 g, 1.2 mmol), and heated to 52° C. in an ultrasound bath for 18 hr. The reaction was evaporated to a viscous gold liquid, which was treated with water (100 ml) and extracted with ethyl acetate (2×100 ml). The combined organic portions were dried (MgSO4) and evaporated to yield a gold oil. Chromatography of this oil on silica gel eluting with chloroform/methanol (98:2) provided the title compound (0.37 g, 14%) as a white solid; mp 199°-200° C. 1H--NMR (250 MHz, d6 --DMSO): 7.70 (m, 1H, ArH), 8.02 (m, 4H, ArH), 8.19 (m, 2H, ArH), 8.71 (d, J=4.0 Hz, 1H, ArH), 9.88 (s, 1H, OH), 10.94 (s, 1H, NH). MS(CI,CH4) 429 (M+1)

Provenance & Evidence